Down-firing speakers are now standard in slim TV designs. They solve the industrial design problem — thin panels with no room for front-facing drivers — but create an acoustic one. The listener clearly perceives sound as originating from below the screen. Dialog feels disconnected from the picture, and the overall impression is that the TV's audio doesn't match its visual quality.

PRISM Rise solves this by lifting the perceived sound image to the middle height of the TV picture. Voices appear to come from the screen, not the stand. The effect is immediate and consistent — dialog locks to the picture where it belongs.

How it works

PRISM Rise combines three processing elements with PRISM equalization.

The 3D process enhances the stereo image carried by the source material, adding width and depth by manipulating level and phase differences between channels. This gives the sound stage more dimension than the narrow, flat presentation typical of down-firing drivers.

Split-Diffuse-Field (SDF) is Eilex's proprietary sound diffusion technology. SDF creates a diffused sound field that enlarges the listening sweet spot and produces a holographic effect on dialog and center vocals. Rather than concentrating the optimal listening position in a narrow zone directly in front of the TV, SDF spreads it across a wider seating area — so the elevated sound image remains stable whether the listener is centered or off to one side.

An HRTF filter provides the actual image elevation, exploiting how the human auditory system determines the vertical origin of sound based on frequency-dependent cues. This is the mechanism that lifts the perceived sound source from below the screen to picture level.

The PRISM equalization stage corrects the speaker system's Acoustic Power Volume Density (APVD) frequency response, establishing a tonally accurate baseline. Without this correction, the frequency coloring introduced by the speaker enclosure and firing angle would undermine both clarity and the elevation effect.

Consistent dialog across seating positions

The combination of image elevation and SDF diffusion means dialog remains clear and correctly positioned across a range of listening positions. This is particularly important for TV, where multiple viewers sit at different angles and distances. The elevated, diffused sound field ensures that the experience doesn't degrade for anyone who isn't sitting in the exact center.

Where PRISM Rise fits

PRISM Rise is designed specifically for TVs and soundbars with down-firing speaker configurations. It works from standard 2-channel stereo input and integrates directly with the PRISM equalization pipeline. For products where the primary goal is correcting the down-firing perception problem — rather than creating a full immersive sound stage — Rise delivers a focused, effective solution.